iio: magnetometer: add clarifying comment

Add a comment clarifying better when to use <device_name> vs
<device_name>-magn in compatibility strings.

Signed-off-by: Martin Kelly <martin@martingkelly.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/magnetometer/st_magn_spi.c

@@ -23,6 +23,8 @@
  * For new single-chip sensors use <device_name> as compatible string.
  * For old single-chip devices keep <device_name>-magn to maintain
  * compatibility
+ * For multi-chip devices, use <device_name>-magn to distinguish which
+ * capability is being used
  */
 static const struct of_device_id st_magn_of_match[] = {
 	{